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P0259 — Injection Pump Fuel Metering Control B High Camrotorinjector

Generic OBD-II · all makesPowertrain (engine & transmission)

The powertrain control module detects that the voltage signal from the fuel pump's metering control circuit is higher than expected, indicating a possible fault in the pump, its wiring, or the control module.

Symptoms

What causes it — most likely first

1. Faulty fuel pump control module (pump)

The pump's internal driver or metering valve can develop a short or fail, causing an abnormally high voltage signal that triggers P0259.

2. Damaged or corroded wiring/connector in the pump control circuit

Broken wires, loose terminals, or corrosion can create a high-resistance condition that the PCM interprets as an over‑voltage condition.

3. Malfunctioning fuel pump driver module or relay

A failed driver module can output excessive voltage to the pump, leading the PCM to register a high‑control signal.

4. Faulty Powertrain Control Module (PCM)

A PCM failure that misreads the control circuit voltage is possible but uncommon; it is typically considered only after other components are verified.

How it's diagnosed

  1. Perform a visual inspection of the fuel pump wiring harness and connectors for damage, corrosion, or loose pins.
  2. Measure the voltage on the pump control circuit with a multimeter while the key is on and the engine is cranking; compare to specifications.
  3. Test the fuel pump operation using a scan tool to command pump activation and verify proper response.
  4. If wiring and pump are functional, check for stored PCM fault codes and consider PCM replacement only after confirming no other cause.

Code facts & related codes

SystemPowertrain (engine & transmission)
StandardizationSAE generic — identical on every make
Related codesP0250 — Turbochargersupercharger Wastegate ActP0251 — Injection Pump Fuel Metering Control CP0252 — Injection Pump Fuel Metering Control RP0253 — Injection Pump Fuel Metering Control LP0254 — Injection Pump Fuel Metering Control HP0255 — Injection Pump Fuel Metering Control I

Frequently asked

Does P0259 mean the fuel pump needs to be replaced?

Often the pump or its control circuit is at fault, but the exact cause must be confirmed before replacement; wiring issues are also common.

Can a bad camshaft sensor cause P0259?

No, this code is related to the fuel pump control circuit, not directly to camshaft position sensor signals.

Is the PCM usually the culprit for this code?

PCM failure is rare; most cases are resolved by repairing wiring or replacing the fuel pump or its driver module.

Will the code clear itself after fixing the wiring?

Yes, if the underlying fault is corrected and the issue does not recur, the PCM will turn off the Check Engine Light after a few drive cycles.